Differential interferometry using a Bose-Einstein condensate Matthias Gersemann, Martina Gebbe, Sven Abend, Christian Schubert and Ernst M. Rasel Eur. Phys. J. D, 74 10 (2020) 203 Published online: 01 October 2020 DOI: 10.1140/epjd/e2020-10417-8